Red acid dyestuff of the triphenylmethane series and process of making same.



useful Improvements of 5 the Tri 'ihenyln ethane A esses for: Making Same, of ing i a specification, r:

-' phenol and one molecular proportion of a of these dyestufl's have the general formula "Hur wettlf le FREE WILHELM EMMERICH, 0Fiiocnsr-on-rnii-limm, GERMANY, ASSIGNOR' T0 FARE- INe, 0F HGCHST-ON-THE-MAIN, GERMANY,

I WERKE VORM. MEISTER LUCIUS & BRI TN "A CORPORATION OF GERMA'N'Y; I

REID ACID DYESTUF F OF No Drawing.

To all whom it may concern:

7 Belt known that I, ,\VILIIEL.\I l bnnameii,

Ph. 1)., chemist, a citizen of the Empire of Germany, residing at Htiehst-on-the-Main,

(lei-many, have "invented certain new and Red Acid Dyestufis i 1 Series and Procl have found that yaluable asvminet'ri'cali 1 ,e' i

red acid dyestuffs 0tthetriphenylmethane group eanphe obtaine by condensing the henzaldehyde (llsLilfoIilC' acids .\'1tll one molecular proportion Of it1l10llQ11lkylt1l111110- diall ylaminophenoh The leuco compounds wherein X stands for an alkylgroup or hydrogen R for a residue of benzoldisulfonie acid; said dyestuffs being, in the form of their sodium salts, red to brown powders readily soluble in water, dyeing wool and silk very pure red tints while leaving intermixed cotton threads undyed. 'lhe tint of the dyestuiis thus produced lies between the tints of the corresponding symmetrically constituted dyestuffs. These dyeetuil's by reason of their excellent eoluhiity have a i great advantage over the syuin'ietrieal dyestull's ohtainahle from ahlehydedisull'onie i acids and nmnoalkylalninophenols, which. are rather diliieultly soluhle. 'ihe tart that y the asymmetrical dyestuil's are of much hetter solubility than a mixture of the diulltt i slightly acidified solution of 16.5 gr.

h r io f;

TRIPHENYLMETHANE seams AND rnocnss or MAKING SAME. v v

Specification of Letter Pat ent. Patented I ()(313, 1?}1 1, Application filed Decemberw; 1910. "Serial No 600,080.

of diethyl in aniinophenol and 1.5.1 gr. of monoethylannnocresol:

i-uiezui' a V O j if whereupon the asyuuuetriral leu eo disul tonieiaeid separates For closing the pyrone ,ring, the dry lelltO-tlt'ltl is heated with five times its quantity of sull'urie acid of (30 ea.

for, some hours tohiU-lilfi (1.; this solution The dyestult' a is precipitated with water and the liltered pyrone-disultonic avid is heated with the necessary quantity of terrie ehlorid to SO-100 C. for converting it into the acid of the dyestull'. The leueo compound of this aeid dyestull' has the formula:

sou: l ter heiugi completely separated hy means ol eouimou salt is liltered oll', dissolved in sodium' uarhouale. again filtered and the sodium salt preripilaled h y uu-ans ol" oouuuon salt. 'l'he roloriug' malter toriusalnownish-red powder whii-h is readily soluhle in water to a bluish-red so lution.

ltai'ing uow particularly desi-rihed my invention, what [claim is:

l. The proress of manufacturing asyur metrical red dyesiuil's ol' the iripheuyl methane series, which ronsisls iu eondeus" ing one moieeular proportion of a heuzaldehyde-disultonie acid with one molecular dyed.

m-aminophenol, and in transforming, after disulfonic acids thus obtained into the dyeproportion of a monoalkylated and one molecular proportion of a Vdialkylated the closing of the pyrone ring, the leuco- 021mm 0 mean): i

l X if wherein X stands for hydrogen which may be replaced by an alkyl group, R for a residue of henzoldisulfonic acid; said dyestufi's being, in the form of their sodium salts, red to brown powders readily soluble in water, dyeing W001 and silk very pure red tints while leaving intermixed cotton threads un- 3. As a new product, an asymmetrical red acid dyestuff the leirco compound of which,

said dyestuff being, in the form of its sodium salt, a brownish-red powder readily soluble in water, dyeing Wool and silk a pure bluish-red tine While leaving intermixed cotton threads undyed.

In testimony whereof, I afiix my signature in presenoeof two Witnesses.

lVILHE-LM EMMERIOH; l/Vitnesses:

JEAN GRUND, CARL GRUND. 

